187584-96-9Relevant articles and documents
Synthesis and optical/thermal properties of low molecular mass V-shaped materials based on 2,3-dicyanopyrazine
Cristiano, Rodrigo,Westphal, Eduard,Bechtold, Ivan H.,Bortoluzzi, Adailton J.,Gallardo, Hugo
, p. 2851 - 2858 (2007)
A novel series of luminescent low molecular mass materials containing a 2,3-dicyanopyrazine central core were synthesized through an esterification reaction between diphenol 10 and different aromatic carboxylic acids 1-6, containing terminal long alkyl chains. They have a similar V-shaped geometry with lack of planarity between the two arms, confirmed by the X-ray structure of the central core. The optical and thermal properties of these compounds were evaluated. They show blue fluorescence in solution (λemmax 440-480 nm) with quantum fluorescence yields (ΦF) from 0.003 to 0.1 and Stokes shifts of around 90 nm. In solid state, optical band gaps (Eg) were from 3.14 to 3.32 eV. Thin films of 11, 13, and 14 exhibited blue fluorescence (λemmax 430-456 nm), and 12, 15, and 16 (more bulky) displayed green fluorescence (λemmax 488-512 nm). Most of the materials exhibited good thermal stability, exhibiting an amorphous glassy state after melting. Transparent amorphous films were easily obtained through spin coating and characterized by AFM analysis.
Low-melting, liquid-crystalline metalloporphyrins
Qing Min Wang,Bruce
, p. 150 - 152 (2007/10/03)
The type of mesophase can be controlled by the addition of side chains to porphyrins bearing several long terminal chains. Either columnar phases or those characteristic of rodlike molecules are formed, whose transition temperatures are lower than those f
